WELL BEFORE HE HEARD the first siren, Rodney King knew he never should have slipped that key into the ignition. They had been having so much fun, he and his buddies Bryant Allen and Freddie Helms, just kicking back, sipping some inexpensive 40-ounce bottles of malt liquor at the local park as they jawed and laughed while the daylight ebbed away. Afterward, they had stood in front of Allen's mom's house trying to croon a few tunes. King wasn't much of a singer but, when he switched to rapping, his buddies felt he was almost in a groove. And then it was after midnight, and suddenly King was driving his car, flying down the highway at 80 miles per hour, the radio blaring, he and Allen singing again, and then there it was—the flashing light atop the highway patrol car bouncing off his rearview mirror, filling his car with a red light that King had learned to dread.